Coffee machine



FIG. 1 is a perspective view of a coffee machine embodying the new design;

FIG. 2 is a bottom view of the design shown in FIG. 1;

FIG. 3 is a top view of the design shown in FIG. 1;

FIG. 4 is a front view of the design shown in FIG. 1;

FIG. 5 is a left side view of the design shown in FIG. 1; and,

FIG. 6 is a right side view of the design shown in FIG. 1. 

CLAIM The ornamental design for a coffee machine, as shown and described. 